170,932 research outputs found
C. Salotti, Il pensiero e l'anima di Augusto Conti
No full textGhio J. C. Salotti, Il pensiero e l'anima di Augusto Conti. In: Revue néo-scolastique. 12ᵉ année, n°47, 1905. pp. 401-402
C. Salotti, Il pensiero e l'anima di Augusto Conti
No full textGhio J. C. Salotti, Il pensiero e l'anima di Augusto Conti. In: Revue néo-scolastique. 12ᵉ année, n°47, 1905. pp. 401-402
Centro Congressi Italia EUR
No full textMateriali preparatori curati dagli autori, bando, lavori e commenti della giuria, documentazione e commento di tutti i progetti presentati ad uno dei più importanti concorsi di architettura italiana di fine '90
Theoretical investigations on the structure of poly(iminomethylenes) with aliphatic side chains. Conformational studies and comparison with experimental spectroscopic data
No full textEffect of low-temperature annealing on creep properties of an AlSi10Mg alloy produced by additive manufacturing: experiments and modelling
No full textThe effects of postprocessing annealing at 225 °C for 2 h on the creep properties of
AlSi10Mg alloy were investigated through constant load experiments carried out at 150 °C, 175 °C
and 225 °C. In the range of the experimental conditions here considered, the annealing treatment
resulted in an increase in minimum creep rate for a given stress. The reduction in creep strength
was higher at the lowest temperature, while the effect progressively vanished as temperature increased
and/or applied stress decreased. The minimum creep rate dependence on applied stress was
modeled using a physically-based model which took into account the ripening of Si particles at high
temperature and which had been previously applied to the as-deposited alloy. The model was successfully
validated, since it gave an excellent description of the experimental data
Aging Profiles of AlSi7Mg0.6 and AlSi10Mg0.3 Alloys Manufactured via Laser-Powder Bed Fusion: Direct Aging versus T6
No full textThe artificial aging heat treatments performed directly on as-built and solubilized AlSi7Mg0.6 and AlSi10Mg0.3 samples were characterized and discussed. The analysed bars and billets (height of 300 mm) were manufactured via the Laser Powder-Bed Fusion process on a build platform heated at 150 °C. Therefore, its influence on the as-built samples was studied in terms of mechanical performance variations between the bottom and top regions. Vickers microhardness measurements were performed to obtain aging profiles after direct aging (175–225 °C) and T6 heat treatments and to highlight better time and temperature parameters to optimize the mechanical properties of both alloys. SEM observations were used to characterize the microstructure before and after the heat treatments and its influence on the fracture mechanisms. Generally, the direct aging heat treatments show the same effects on both aluminium alloys, unlike the solubilization at 505 °C followed by artificial aging at 175 °C. The strengths vs. elongation values obtained after the direct aging treatments are better than those exhibited by T6 as highlighted by the quality index
Change in Mechanical Properties of Laser Powder Bed Fused AlSi7Mg Alloy during Long-Term Exposure at Warm Operating Temperatures
No full textAl–Si–Mg alloys are most commonly used to produce parts by laser powder bed fusion for several industrial applications. A lot of papers have already focused on the effects induced by conventional heat treatments on the microstructure and mechanical properties of AlSi10Mg alloys, rather than on AlSi7Mg. Nobody has investigated thermal stability during long-term direct and artificial aging heat treatments of AlSi7Mg. This study investigates the changes in mechanical properties induced by long-term exposure (512 h) at 150 and 175 °C (the operating temperature of AlSi7Mg) after (i) the laser powder bed fusion process performed on a pre-heated build platform (150 °C), and (ii) heat treatments to the solution at 505 °C per 0.5 and 4 h. Thermal stability was evaluated through both Vickers microhardness measurements to obtain the aging profiles, and tensile tests to evaluate the mechanical properties in specific conditions. An optical microscope was used to investigate the microstructure. It was found that aging at 175 °C confers the same effects induced by a secondary aging heat treatment on as-built samples and, simultaneously, the worst effects on the solution heat treated AlSi7Mg alloy after long-term exposure. The AlSi7Mg DA at both 150 °C and 175 °C showed the same Vickers microhardness (~95 HV0.5), UTS (~300 MPa), and YS (~200 MPa) values for the longest exposure times because the fine and cellular α-Al matrix confers higher stiffness and strength despite the over-aged conditions. On the other hand, the coarsening effects that affected the precipitates during aging at 175 °C, as well as the formation of the precipitate-free zones along the grain boundaries, justified the highest detrimental effects induced on the SHTed samples
Ab initio studies on the isolated, hydrogen bonded and solvated N-methyl-acetamide: stationary points and intrinsic reaction coordinate
No full textFreeze drying of pharmaceutical excipients close to collapse temperature: Influence of the process conditions on process time and product quality
No full textStudio ab initio del comportamento conformazionale del PIDOTIMOD, un agente immuno stimolante sintetico
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